Selenium Fractionation and Speciation in Paddy Soils and Accumulation in Rice under Field Conditions

• 作 者: ShaoYixian;CaiZihua;SongMingyi;
• 机 构: Geological Research Center for Agricultural Applications of China Geological Survey,Hangzhou 311203,
• 出 处: 2016年全国农业地质应用研究学术研讨会
• 发表日期: 2016年期

　　Soils, as well as paddy tissue samples, were collected in the Se-rich area of Jinhua County, Zhejiang Province, China.Sequential extraction procedure was used for selenium (Se)fractionation, including soluble Se, exchangeable Se and carbonate-bound Se, iron and manganese oxide-bound Se, humic acids-bound Se, organic matter-bound Se, and the residual Se fraction.The results showed that soluble Se, exchangeable Se, carbonate-bound Se, iron and manganese oxide-bound Se fractions accounted for less than 2% of the total Se, respectively.Organic matter-bound Se was the dominant fractions.Average concentrations (mg/kg) of Se in the paddy tissues were 0.069 in seed, 0.263 in root, 0.09 in stalk, and 0.17 in leaf.The organic matter-bound Se had a significant indirect effect on Se accumulation in paddy tissues.In conclusion, organic matter-bound Se was an important fraction and source of plant Se in agricultural soil.